Continuing lack of connectivity

I have experienced months of either no service to my business phone and ADSL lines or when it works the line it is so noisy that I cannot hear what is be said. Additionally the line gives a continuous engaged type of signal during conversation. This has been reported numerous times and numerous technicians have been here. Telkom sms's me afterwards saying that the service is repaired. It isn't and I again need to report it as being faulty. Each time this happens it takes four to five days until I am again told that the fault is repaired. I am sick of Telkom and wish that there was an alternative!